Thanks for the replies! Gonna try them tracknuts definately. I bought the chain new two months ago, by the way. Boy oh boy how sweet this fixed riding is, I'm already going up the hills around Arnhem (Netherlands) faster than ever. I thought the tall gearing was going to do my legs in, but they beef up real quick this way! And i'm already way faster than any bike rider downtown. Sorry about the self-congratulatory hee-haa, but I'm, well, just so damned pleased with my fixie!
thanks again!